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BigRedMachine
02-14-2005, 10:53 AM
I had my Cobra (96 4.6) dynoed this weekend with a best pull of Max POWER=259.6 and Max TORQUE=271.3. Does this sound about right for this engine. It's stock besides the K&N Air filter.

I'm just wondering because I thought I would get a little more out of the ol' 4.6

Lumpydogs
02-14-2005, 12:11 PM
Sounds reasonable to me. I know that most of the stock '01 Cobras
dyno'd at 260 - 270 rwhp fresh out of the dealer showroom.

BigRedMachine
02-14-2005, 01:25 PM
OK, I was wondering whether it was in line with the rest of the 4.6 Cobra engines. Thanks.

cobrabitn
02-14-2005, 11:30 PM
It's in line but it all depends on the mileage. I would say it's a tad low by about 10 rwhp, but still very respectable.

Lumpy, most 01's were in the low to mid 270 's range.:)

BigRedMachine
02-15-2005, 10:52 AM
I was thinking it was a little low too. My car has around 91K miles on it.


I guess I should stop acting like a :baby: , and invest some money

cobrabitn
02-15-2005, 12:51 PM
You can easily get into the 290-300 range with some modifications. If I still had my 99 Cobra, the first thing that would go in it would be a set of gears. Try a set of 4:10's and see if that doesn't wake it up a lot. :)

BigRedMachine
02-16-2005, 08:58 AM
If Uncle Sam gives me a break during tax season, I might just do that ;)

Abneriel
03-05-2005, 06:31 PM
you got those numbers out of a 96? The torque number seems a bit high for stock. Stock power for your year is 305 hp 300 tq. Assuming a 15% drivetrain loss you should have gotten 259 hp 255 tq. The hp # seems right on the money, but the tq seems higher than it should...not that you should complain though. With the number of miles on your car, a good IMRC cleaning should give you some added ponies.

jack
03-05-2005, 10:18 PM
I hope thats not your car all bent up like that!!! If it is, your lucky to be alive!!!

johnbasf
03-05-2005, 11:59 PM
I was thinking it was a little low too. My car has around 91K miles on it.


I guess I should stop acting like a :baby: , and invest some money

Mine was right there with you with the K&N. :thumbsup: :thumbsup:

Abneriel
03-06-2005, 02:45 AM
I hope thats not your car all bent up like that!!! If it is, your lucky to be alive!!!
it's not my current one anyway :eek:

live and learn...some just learn the hard way

Yellow98Snake
09-17-2005, 10:45 PM
A 96-98 Cobra will dyno around 260 or so RWHP on a DynoJet, stock. Mine pulled around 259 to 263 peak RWHP (depends on the data smoothing settings) when it was mostly stock (intake silencer pulled) back in 2001.

I managed 268 lbs-ft torque as well.


I had a second dyno done about two years later after installling a MagnaFlow catback, 4.30 gears and a DenseCharger meter forward system and managed 260 RWHP and 258 lbs-ft of torque.


Your numbers look healthy to me.

jsnake
09-18-2005, 12:13 PM
My 98 put out 259 rwhp 258 torque. But, that's after Ford shortties and a complete Bissani exhaust. Mac cold air cleaner and a computer tune. I think I need to look at the IMRC.

99CobraCrazy
09-18-2005, 07:20 PM
Ok perhaps i'm just not putting the words to it but what does IMRC stand for?

:doubt:

Yellow98Snake
09-18-2005, 07:37 PM
IMRC: Intake Manifold Runner Control

A set of computer controlled butterfly valves in the 96-98 Cobra intake plenum that cuts off flow to eight of the sixteen intake valves at low RPMs. This is to induce swirl in the combustion chambers to help promote torque at low RPMs (and probably for emissions reasons). At about 3250 RPMs, the ECM signals the valves to open, and allows air to flow through all sixteen intake valves. This promotes high RPM power.

99+ Cobras no longer use IMRC.

tcrews
09-18-2005, 07:45 PM
Ok perhaps i'm just not putting the words to it but what does IMRC stand for?

:doubt: Intake Manifold Runner Control.
This is a '96-'98 Cobra feature. It's designed so that under 3250 rpm you are using 1/2 of the intake valves to promote air velocity (torque). After 3250 rpm the secondaries (butterflies) open to allow air flow through all sixteen intake valves allowing greater air volume (horsepower).

Greater air velocity at low rpm gives greater torque while greater air volume at higher rpm gives greater horsepower.

Pro-Dyno
09-19-2005, 08:48 PM
I ran 3 of these cobras this weekend and they made between 262. To 280. Before the tune:) <?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p>

tgentry
09-22-2005, 02:57 PM
Get some underdrive pulleys, and open up the air silencer. That will wake things up with minimum investment.